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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003958b97fd3a66fdaedad9baad79c2876060a132c2dfdf2aa18399807cbab2d' 
  AND token = 'IUUkfGOF3wUvgIayyHABRi6hu7maLvj6l8sfy61YuWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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