SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b19ceb91bdead8ecb7f6ad77c5043bfc6f753e157f354849f414b8c9104887' 
  AND token = 'mGTvkmSiYyjKl33W+ea/SqefuTBS8+1c0KeA9enMbfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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