SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadc9769bd1eb84b80dd1087db16ca441f9f500db20d61a8dd9450a6645131ca' 
  AND token = '3fL+p+6h3+zQ8pzu9+6yGtZ/YRM7zZrcCgJsVi5vms8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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