SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9f8b640487d5358f324371fe4db2d017748722251483bcc0945d505df4637a' 
  AND token = 'EIrMKmwj7LEYSIo/EuzNqVb0PpUpOufkB2Mwn2QBdJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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