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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17203273a73f398453dfe067e335a5eb029a380a3f6719414a0cd911267fbbab' 
  AND token = 'QktFKMYZotlD1CqIyffVWwkkB1fUxdM+cknKN0B4T0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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