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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01ca8f9e9afae4cab09925258742741aa4735a3ecb9d03ee71caa0c66deb442' 
  AND token = '6K/wd8d6AVL0lNi6hukC3U0JBwePxjVuCIg+BWtRSx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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