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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31819fab67d839ad9ebe2d4080975e3964b05c5f2876691f1ae3487326b072c8' 
  AND token = 'JzpUARTs1FuAqJUuNVNr7d0QmsbUsYj1Jjk0vaOD7xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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