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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5535df8509b01e1b9360b8dbc65bbccd5fae0c31efa1f8af7196c32bfbbbfd65' 
  AND token = 'H9D8wwH3LqJ0124GvG4c1QSB57oGYgfUGHah2dLX7co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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