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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e310ac9c6faef681ca905a265a6b876fc620dc091de02da60e7b95066c8d03' 
  AND token = 'RZcUe1KbfLcLyOEwnskyxYhmwKc9aUy5QBaYS0mXl+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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