SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e929994b6d454936e1e28fc5f307d6dee82df12aa6f9080554d5d0b06c7acf6' 
  AND token = 'BQzNqjz8kHXTQBQ05Eg7HpKMaZicmRG/Rjrurupkqrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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