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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd549f6856f7c93aaa20fc7d4e3463d743d7b9e3b634c8ce551e7c298c7366751' 
  AND token = '4WnXjVw5RbsbtOeIOaFM8QwxfKrygmt9TuCoiYOfwbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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