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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d4ebaa9f5749a32b58d9e4e9bd49f1d976cd02dbccfdd7b59edd2b3f93d85e' 
  AND token = 'k/pDwvcj16c5gcqYY7+yF4irEDFJiLG2hsJR+lNRYv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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