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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7df9fc50c85710f97c054c46ec087cfc893ac13d28e0d272a1441c2a40a3309' 
  AND token = 'xk5KuJSOwv0TZKl4BDsNQOpV8tVom3sV/v2kuK+byr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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