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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea143fdb84b21463e1e05f2f06506218812ac1de20bbf4fcec4f7e6b71a3698' 
  AND token = 'JPaUNa6oD8UDouxXKyaGqLTuXjzCywrhistIMjQrrAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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