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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c54bd575b2e46856c71919ac6711e5c6ac82c46552ccf2c366e6cc7c8fbfda' 
  AND token = 'ZEc5DRc0h03iJNxC3mnR87o2VJ8HRIUlVImCaE7jF0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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