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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4e7a3cbda6f48203a7fec9764d874a61bceb3b14b81ce34b5704b9db1c37b7' 
  AND token = 'xDNQ/WFwYkJE/e/cg5oWO6dVtmDProdqK7UIVzvL9Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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