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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71497f7afedb4b14a79758aa0ac505221207d4a4838945bceaa16b4b25aa4a83' 
  AND token = 'E1cZVbbxDw/zkg8+9qGIknL2J0UWk+9jP5hTp9WDJno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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