SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b2288ae91d848ac6f70951a8a6bc2f39093edc5b15e7f184cd20d529639505' 
  AND token = 'wIlZUtj8OCW/W93vGbYqjp0RwPMDGGrqA/xYjjIxAO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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