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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60517173da72b4e4f9d2aaab6a33e97e75547c843e09da083459c17e2605307' 
  AND token = 'AuXiSED3HtLl5Kpo4+hgeljxQBJQwT3vWApeuWEJLwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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