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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e094ebf0ab780491411827e64b7eb9f9d823c3dad3ecd38fca52ccffd621e92' 
  AND token = 'xgHbES3K/ACo3MSj4Vj5Cdf4o8mums82IM7X/DbZU+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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