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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7b903ffa817c334683de10cbf65f8080ac6ebac6fbf7675ebd023a68074bb2' 
  AND token = '9z5iqMcAzabt43cMRHC8Dymfh8dL2iNVNe/p9/ZE8M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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