SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2246573da8563a7c1145dbcd8239b69b00360227ff132fb1e87ad369352d110e' 
  AND token = 'YDnHpUNwsm6pUlCKzjZ+TVeoHQa+NvlSooBwI+5NxiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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