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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b8b11391800db8703407f1229f52543f1c2c183e053bc26b32eead09ada537' 
  AND token = 'mEhkij9DJDFth9PR7pxeqRzFoIK2PCzc5zggdcYfntA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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