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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8aa0e1dbd3b685fd6cc834c116a6b9890d7ee5b587d2e6fbe6ead0007060ce1' 
  AND token = '/K638vjK1OPb3RbJEbfOj7OMFE49vDIT3mT+7MqyNTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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