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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12573c8b8b966093198f157d04118a7a22e1cbf39f3a4d9f3dd9da7d46d269f' 
  AND token = 'G6QUv19U6nbfEGxltkav3KAoZPkOqeZpxDDJIYIFlCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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