SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10455648604e0d12f0b8b6a6049ff5a7b935353dc662121a7af4e4825afa380c' 
  AND token = 'SbI+HOrv/9WYshgASyiwexU3R3vwZHqhvF2koLuoGLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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