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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8d2b4cd839653f8d705b721f89acbd8b9d877301106a24af4ddc2aabc6f97d' 
  AND token = 'HI9w3L1jjbHx3+OcZGP/vyetiAsxyDZW8ofGzandnXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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