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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d514d067aef0b86cb72fca4b9206dab63742e5b9e8c43462e875d8815c762e' 
  AND token = '9B4YGJC4axbkoCTvbXCkBhzMSIuAbGHcqID5oNGz8K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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