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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7ccbc7938e1d654801830e1e29c4a6c9bf2ac14b2ae2b94891649ea69625ac' 
  AND token = 'v9MJW8XknKZZdi46wTJF3xW3URBDWCuTjMNGcvt2QoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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