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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caacd66c19d79dbbe17239dde1259885dca03de877f726687b5e0bdc93a4d684' 
  AND token = 'dGrWNwA6p+RZbr0AlaRb5cEX9m2fEj2bYyHxz11SmkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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