Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ec95b4f5d7fe66295e2784b60cff73e18d229a649de403696735fd9aa21548' 
  AND token = 'F6rbvrsYhOzMlPpF3ZzPFMjWXzc5bNMpyREpcnyCDvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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