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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6ab5a27e77a6e2aa0ba8fd52ddd2a140d31b64abf423a5b9da4515467b9796' 
  AND token = 'v5nFAmqNrqK8RsHl68gMeQJGK062cxK5jH9Cb+7LEuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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