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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835fc82b889a3ef218944ac7f5596ff87b9c1b066615fa9dec968c4acdc5fb2f' 
  AND token = 'nzTSmSlkdavNQ6LPCmk7FLCZ8gH8orvK1p7Dhhz4l0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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