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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802765b3c7f5c1edd4543b4a255e6ce5aab5f9fdf49508fc5047b2c69a62464d' 
  AND token = 'bMQvISMBvQrtQnQZ4PgWn/yofB7k6P/J2tInvU/ZYSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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