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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa324658498787a9d0707d9821450c2eddca77e22d6b96aec19e8ccd241f7ff9' 
  AND token = '5reyHxgazMtEq5xUHX5Vz9BBU7pOwV8kxTUmt9Mo0wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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