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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd89cfdcf709c2d9a6c0ebc17f99e164b591a9e3c7763b14abd2905fe94e725c' 
  AND token = '9Xw7APHu8qWsjPTslus0v/MOeOs0ZIcmL6XtZaH7AsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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