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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffff805949a61b4a191fc0b3de1d5849446c8b9ee14e05263f99ae85328cd068' 
  AND token = 'U0SQbT13B4h6A5hbdYZdMEZyLn0uBAxTNEx7Co3GV9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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