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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2bd2856a99bb5c3073dc89ce5d4c8baa996e950c5e5a3958fc7a060d6ef64d' 
  AND token = '9bhtLKhJxwSuACzZz2MN2eO39ejVDmvdZM1ov4UWRFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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