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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76ba2b8e27ea6b370a295d014a14109942b8f1036a46cf337a562f19a002e2f' 
  AND token = 'OhmiJGjF/iyvKnYqAjp6g7rAvLldxi2et12rQX83pDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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