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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecb5785e2b2bfc3c3e8d159dbda792f58c92da058a72768d42db3ffb2ae206e' 
  AND token = 'lWOx3504lQkUTRAPL11jmHzpozCIdZQevX4UVTNlpCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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