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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6876fc3999404b621acaa9a5a513f4dc092c06c4575478e55bf81a61bc0e9cac' 
  AND token = 'fO/Q/hnRemhn/4cVUxJRKKEKYcNIzV3tu4Vuu3PUQvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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