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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb716041904eb45b59fcce38a779b5538e31db87dedd2929854b2c929f6e9dd' 
  AND token = 'Bdx4elt+9N/I0s0AE+3F/vUi7kgZ/S8GpskhL/Ig5gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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