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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdd7ff145756f961d01db87ace56abc884a4b5b4945ca86cd7eb66f8694692a' 
  AND token = 'cuV2Vfvx/7w9vZOlDwKiX1msBsi6moa7X30OTK5jX54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}