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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b65a661e199adf15a66f0911a196d0961b7ef2a06c481b535b40ba8ade5b638' 
  AND token = 'Z5LnIJSSHBfZ7PPB5ctBJuuI/ewf5oGoc4IXGJj+j70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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