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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc88f2714e692d662dc00def6bfdeab471d5595e6d9183d280323edaf4ea54fd' 
  AND token = 'R4Av2wIIHgUl5Kfc31HgiHDdeeIvNjhNt+YPQX+tCSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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