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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff6dedb9b803e39be71efdbeaf52138f01c3b41a960ed3f1b05865d9f31f9dd' 
  AND token = '9rY1yX96B6SCRb1jUm0RCu8BbpSkqbLT5RxFWcOkAP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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