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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394d06ef705fa8ad0206cc2f43dc465a201ad10d9c8654d1484a16e5d3174f5c' 
  AND token = 'AoMGTmzKGHFtTlT4Myczb94rYvlxPhc6K8OcYw8bXso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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