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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f21db3b36dfe99492bcb93a6c397359350e79071fc4c211a2fd76963fa5d40' 
  AND token = '8qo3P5gpYLIQtHXXErJ9WUTCXbN03ZFeViKQYk32WkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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