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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e1e3e6e42efe659b97b81da3babaa49781390e2b3ab0c02f24514531b6d764' 
  AND token = '4sAhr17ZZorj6ZMDQgpONM13vNlzPaEQfi9S5Dljpf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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