SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07c483bd4142f256897a6a90188cd0016850fda18c6f7c4d1293d3831d37402' 
  AND token = 'SCCuBmgtkVkVOlUDYB9OP9HvEKrHgsKB9hGYy+tQuJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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