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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1144e581d79dbfe2eeb842aa4f3334c1bd487968a95d1111c4a3eb22c2cd93cd' 
  AND token = 'xdFZZClTsjOOE+4QU6xYQHgIUMQLUbIbMn6I4AJ5Hmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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