SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084acdd2c6b6e2a4ba33994a8154040a86728886c3765f9458f409e3763225cf' 
  AND token = 'b1z+iWm7lfBKg+kaJkWt/rCzqk8EhRPk6+EpXsvsu/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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