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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea829f96965add6ab95385962ef215ae077071b5b10fe6de35078b0e4a9d931' 
  AND token = '43yryYoXwhg7dIXMi8VX5w0YbGWbNA6jg7iLCgaryVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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