SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0822d566e28cc8856692acd260c9f38641694a4f4f8a900eb54c167fa2a4319f' 
  AND token = '/C50CiP+S4Hy/wAE/K8gYZtPGQ8zUoJhlsLUQYCeVDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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