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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa44f24c03169e39c67a072f3ea433143c3ea929d05e46254a5b148b220051a' 
  AND token = 'Xr1zU30WMqAqneT2wVol0/z8ACzHEWodU75QNa8xKQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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