SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475ea4e05c17a810586f60e47330eb9811160437b946ed7af4180682605e0b27' 
  AND token = 'fZVvV201vBRcDIvUjqHM0QlVl0q/9YrYWyWDty4O1h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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