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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10412084e3ad155ff8a886ef288f881a07f7f616690b2655f7bad5ad73a41e0f' 
  AND token = 'l6lGb9+J/projsnhq13+OZxey3LnSmdUJbU7Xap4W98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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