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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f349a6f6bcf28b076f0fe5c57806138d8d178ac9c21afe871373ed9339c36e91' 
  AND token = 'sG5wrEifuoMcWGoOl6uPySfuMVXWzohpZO6Gk1UE6pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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