SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a250ba9991c16eec60a9e587cfd26bafa0872c736db1c288f717b1127e6133' 
  AND token = 'QGGgf9gv/QW6lppfCOPEke4rbYVwq6ToOK8EKOZFCl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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