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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbaea1b16d61aa7d2b94e601ff4759a68f8ef1c865bc8d720159c2f929185ed' 
  AND token = 'QeYRUcO9uBD5mNR2fzpRNadI96bIX6elNXBetA5LODA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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