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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9822ae96bf323b789be38d2af0111a150dc63ad92708e7c4d4857f1cb99a3dbd' 
  AND token = 'msH75y2r5aCYYYvaXBPqcEJPwcw4v4E4oNVcOaL9T3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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